Chimney



Feb- 8, 1966 c. KRAFT DE LA sAuLx ETAL 3,233,595

CHIMNEY Filed Dec. 16, 1963 I llIII t Il 4o Il l 45 i tzr.: 'l Ig ll I I l f/ '9 l Je 42 1.7/ 4b gb Mb/ 8 44 X w f l l. I

l 4a fus/ QSA @Y T%J Il' I 41a' 4i l 4 6 l '/'v |'h 44 n A n l l .l Y 5 /A/Vf/vraed United States Patent O 3,233,595 CHIMNEY Christian Kraft de la Saulx, 57, Ave. du Centenaire,

Embout-g, Belgium, and Nicolas Salier, 4, Rue de Moineaux, Liege, Belgium Filed Dec. 16, 1963, Ser. No. 330,853 Claims priority, application Belgium, Jan. 7, 1963, Patent 626,883 3 Claims. (Cl. 122-7) To cool hot gases, inter alia the gases evolved in the conversion of steel by blowing onto a bath of liquid iron, it is known for the processing plant to have a chimney at the top which has hollow side walls for cooling water, the side walls bounding a central duct or passage through which the gases tlow. In a chimney of this kind, the side wall inner surfaces which engage with the gases are plane and smooth with a view to considerably reducing dust and other material thrown out of the converter from sticking or being deposited on the walls; this type of surface impairs heat exchange. At the bottom of the chimney the gases have a high temperature and heat exchange with the wall is mainly by radiation; consequently, smooth walls at the bottom of the chimney lead to a satisfactory heat exchange. However, this is not the case higher up the chimneyi.e., in that part thereof where no dust or deposits or the like arrive and where the gas temperature has considerably decreased; in this upper part of the chimney heat exchange by radiation decreases, and so for satisfactory cooling of the gases the chimney must be high, particularly if the volume of gas is lrage.

This invention relates to a chimney of the kind specified which, with a view to providing satisfactory cooling of the gases, whatever their volume, in a chimney of normal height, is distinguished in that it comprises a first section where heat exchange by radiation is predominant, followed by a second section where heat exchange occurs mainly by convection. Consequently, a chimney according to the invention has at the top part of its central duct a bunch of water tubes which communicate at one end with the channels in the hollow side walls and which have their other ends associated with a collector reservoir or tank or the like communicating with the last-mentioned channels and disposed at the periphery of the exit orifice of the central duct, such reservoir or tank or the like extending the walls which bear it. According to a feature of the invention, the tubes of the bunch are inclined and start at the channels of one wall to extend to that part of the collector tank which is disposed on the opposite wall; also, consecutive tubes of the bunch are inclined alternately in opposite directions.

Other features will be disclosed by the following description of the single gure forming the accompanying drawing which is a partial diagrammatic perspective view of the top end of a chimney according to the invention, with part of one wall removed to show the interior.

Referring to the drawing, which shows only those elements which are necessary for an understanding of the invention, a chimney comprises hollow side walls, as 2-5, which bound a central duct or passage or the like 6. The hollow side walls have channels in which there is a ilow of cooling water i the direction indicated by arrows X, while hot gases ow through the central duct or passage 6 in the direction indicated by an arrow Y. Slightly below the exit aperture 7which can be lateral instead of central-two opposite side walls, for instance, the walls 2 and 4, have internal projections 2a, 4a respectively. Inclined tubes 8 have their bottom ends 8a communicating with the 3,233,595 Patented Feb. 8, 1966 Fice inside of the bottom projection Ztl-ie., with the channels inside the wall Z-and the top ends 8b of the tubes d open into a horizontal cross-tube 9 which merely rests on a top projection 4b of the opposite surface 4; the horizontal tube 9 is connected by vertical tubes to that part of a collecting reservoir or tank or the like 10 which is dis* posed on the wall 4 around the exit aperture 7. Some of the cooling water of the wall 2 ows into the projection 2a. and then into the tubes 8 and the tube 9 to reach the reservoir 10. Similarly, inclined tubes 11 have their bottom ends 11a secured to the bottom projection 4a while their top ends 1lb engage in the cross-tube 12 and just rest on the top projection 2b; the tube 12 is connected through vertical tubes 13 to that part of the reservoir 10 which communicates with the wall 2 opposite the wall 4. Tubes 1l alternate with tubes 8, and some of the cooling water fiows from the wall 4 through the tubes 11-13 into the tank iii. The same is connected to the base of the chimney through vertical ducts 14 through which the water i'lows to the base region of the chimney.

In one embodiment of the invention, the collecting tank 10 extends to side walls which bear it. Disposed at the levels of the projections 2a, 4a and 2b, 4b are outside collars 16, 17 which form clamping belts or straps or the like to take up horizontal thrusts at the levels where the two crossed tube bunches are supported. Fitted to the tank 10 are mechanical water and vapour separators, 15, the water returning to the tank 10 while the dry vapour is removed to atmosphere.

A chimney of the kind hereinbefore described has the great advantage of providing considerable heat exchange by convection immediately before the gas exit.

What we claim is:

l. A cooled chimney for steel making converters and having hollow side walls with water channels constituting a central duct for the passage of the gas to be cooled, a bunch of water tubes in said central duct, a reservoir tank located at the top of said hollow side walls and surrounding said central duct, a vapour separator on said reservoir tank, said water tubes communicating at one end with one side wall and at the other end with said reservoir tank, said water tubes being inclined and starting from one of said side walls for terminating in that part oi the reservoir tank located on the opposite wall, said reservoir tank v being directly supported by said side walls, bottom projections on the inside surfaces of said side walls for receiving the water tubes bottom ends, a collector tube receiving the water tubes top ends, top projections on said inside surfaces for supporting said collector tube communieating with said reservoir tank.

2. A cooled chimney for steel making converters and having hollow side walls with water channels constituting a central duct for the passage of the gas to be cooled, a bunch of water tubes in said central duct, a reservoir tank located at the top of said hollow side walls and surrounding said central duct, a vapour separator on said reservoir tank, said water tubes communicating at one end with one side wall and at the other end with said reservoir tank, said water tubes being inclined and starting from one of said side walls for terminating in that part oi the reservoir tank located on the opposite wall, said reservoir tank being directly supported by said side walls, bottom projections on the inside surfaces of said side walls for receiving the water tubes bottom ends, a collector tube receiving the water tubes top ends, top projections on said inside surfaces tor supporting said collector tube communicating with said reservoir tank, and external clamping collars on said side walls at the levels of said bottom and top projections for taking up the horizontal thrusts of said water tubes.

3. A cooled chimney for steel making converters and having hollow side Walls with water channels constituting a central duct for the passage of the gas to be cooled, two bunches of water tubes in said central duct, a reservoir tank located at the top of said hollow side walls and surrounding said central duct, at least a vapour separator on said reservoir tank, said water tubes of said two bunches being crossed so as to be inclined alternately to opposite hands, bottom projections on the inside surfaces of said side walls for receiving the water tubes bottom ends, two collector tubes receiving the water tubes top ends, top projections on said inside surfaces for supporting said collector tubes communicating with said reservoir tank, said water tubes starting from said bottom projections for terminating respectively in said collector tubes located on the opposite wall top projections, and external clamping collars on said side Walls at the level of said bottom and top projections for taking up the horizontal thrusts of said water tubes.

References Cited by the Examiner UNITED STATES PATENTS 11,22() 7/1854 Greer 122-253 255,484 3/1882 Bogert 122-253 500,166 6/1893 Sturtevant 122-253 2,552,044 5/1951 Huet 122-7 2,552,505 5/1951 Patterson 122-7 POREEGN PATENTS 1,009,223 3/ 1952 France.

12,495 9/1955 Germany. 16,652 9/1900 Great Britain. 891,112 3/1962 Great Britain.

OTHER REFERENCES German Printed application No. 1,063,191 printed August 8, 1959,

KENNETH W. SPRAGUE, Primary Examiner.

FREDERiCK L. MATTESON, JR., Examiner.

D. G. BLACKHURST, Assistant Examiner. 

1. A COOLED CHIMNEY FOR STEEL MAKING CONVERTERS AND HAVING HOLLOW SIDE WALLS WITH WATER CHANNELS CONSTITUTING A CENTRAL DUCT FOR THE PASSAGE OF THE GAS TO BE COOLED, A BUNCH OF WATER TUBES IN SAID CENTRAL DUCT, A RESERVOIR TANK LOCATED AT THE TOP OF SAID HOLLOW SIDE WALLS AND SURROUNDING SAID CENTRAL DUCT, A VAPOUR SEPARATOR ON SAID RESERVOIR TANK, SAID WATER TUBES COMMUNICATING AT ONE END WITH ONE SIDE WALL AND AT THE OTHER END WITH SAID RESERVOIR TANK, SAID WATER TUBES BEING INCLINED AND STARTING FROM ONE OF SAID SIDE WALLS FOR TERMINATING IN THAT PART OF THE RESERVOIR TANK LOCATED ON THE OPPOSITE WALL, SAID RESERVOIR TANK BEING DIRECTLY SUPPORTED BY SAID SIDE WALLS, BOTTOM PROJECTIONS ON THE INSIDE SURFACES OF SAID WALLS FOR RE- 